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| AFE5804_1 Datasheet, PDF (5/61 Pages) Texas Instruments – FULLY-INTEGRATED, 8-CHANNEL ANALOG FRONT-END FOR ULTRASOUND 0.89nV/√Hz, 12-Bit, 40MSPS, 101mW/Channel | |||
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AFE5804
www.ti.com.................................................................................................................................................. SBOS442B â JUNE 2008 â REVISED NOVEMBER 2008
ELECTRICAL CHARACTERISTICS (continued)
At AVDD_5V = 5.0V, AVDD1 = AVDD2 = DVDD = 3.3V, LVDD = 1.8V, TGC mode I, single-ended input into LNA, ac-coupled
(1.0µF), VCNTL = 1.0V, fIN = 5MHz, Clock = 40MSPS, 50% duty cycle, LPF = 12.5MHz, internal reference mode, ISET = 56kâ¦,
LVDS buffer setting = 3.5mA, and ambient temperature TA = +25°C, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
EXTERNAL REFERENCE VOLTAGES (ADC)
Reference top
VREFT
2.4
Reference bottom
VREFB
0.4
VREFT â VREFB
1.9
Switching current(4)
POWER SUPPLY
SUPPLY VOLTAGES
At 40MSPS
AVDD1, AVDD2, DVDD
Operating
3.15
AVDD_5V
Operating
4.75
LVDD
1.7
SUPPLY CURRENTS
IAVDD1 (ADC)
IAVDD2 (VCA)
TGC mode I
CW mode
IAVDD_5V (VCA)
TGC mode I
CW mode
IDVDD (VCA)
ILVDD (ADC)
All channels, TGC mode I, no signal
Power dissipation, total(5)
All channels, TGC mode II, no signal
All channels, PW mode , no signal
All channels, CW mode, no signal(6)
No clock applied, no signal
POWER-DOWN MODES
Power-down dissipation, total
Complete power-down mode
Power-down response time
Power-up response time
PD to valid output (90% level)
Power-down dissipation(7)
Partial power-down mode
THERMAL CHARACTERISTICS
Temperature range
0
Thermal resistance, TJA
Thermal resistance, TJC
AFE5804
TYP
2.5
0.5
2.5
3.3
5
1.8
99
123
63
7
54
1.5
68
896
808
840
525
528
52
1.0
50
95
32
4.2
MAX
2.6
0.6
2.1
3.47
5.25
1.9
110
136
75
10
61
3.0
80
985
898
925
575
68
85
UNIT
V
V
V
mA
V
V
V
mA
mA
mA
mA
mA
mA
mA
mW
mW
mW
mW
mW
mW
µs
µs
mW
°C
°C/W
°C/W
(4) Current drawn by the eight ADC channels from the external reference voltages; sourcing for VREFT, sinking for VREFB.
(5) Programmable power affects on the front-end; ADC power consumption remains constant at about 57mW/channel for 40MSPS.
(6) ADC powered-down during CW mode.
(7) At VCA_PD pin pulled high; see also Power-Down Timing diagram.
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): AFE5804
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